Finding the Fourth Proportional to 85,843.72, 128,802.57 and 46,428.58

Step by Step Solution

1. Step 1: Write the proportion equation
   85,843.72 : 128,802.57 = 46,428.58 : x
2. Step 2: Convert to fraction form
   85,843.72/128,802.57 = 46,428.58/x
3. Step 3: Cross multiply
   85,843.72x = 128,802.57 × 46,428.58
4. Step 4: Simplify right side
   85,843.72x = 5,980,120,425.45
5. Step 5: Solve for x
   x = 5,980,120,425.45/85,843.72
6. Step 6: Final answer
   x = 69,662.88